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Water (231, rev. 6)
By  Hiccup on 10-19-14, 09:23 am
Category 'Effects and decorations', known, fully documented
If you plan to make the water move by itself, it is advised to use only speed values between 0 and 127 because it does not work properly with lowering values.
Data files:
• /enemy/suimen_texanim1.nsbtx
Sprite fields:
Input ID 1: value at nybble 0-1. On ID 1 the water will rise then lower. (This is wrong [E version])
Input ID 2: value at nybble 2-3. On ID 2 the water will rise, but have to be activated again with a stop command to lower.
Water lowering's delay: value at nybble 4. Any value other than 0 will override both Input IDs.
Water rising's delay: value at nybble 5. Any value other than 0 will override both Input IDs.
Opacity: value at nybble 6-7. Modulo 32. 0 is transparent. 31 has the highest opacity.
Tiles to move: value at nybble 8-9
Speed: value at nybble 10-11. Modulo 128. If lower than 128 then the water will rise, if greater or equal than 128 the water will lower.
Water (231, rev. 7)
By  Hiccup on 10-19-14, 06:47 pm
Category 'Effects and decorations', known, fully documented
Lowering water does not work without events.

There is no way to make water only appear in a zone; like in NSMBW, but you can emulate this with the unused water tiles or by quickly rising the water when you enter an area and lowering it when you exit it (with the "if" event controller).
Data files:
• /enemy/suimen_texanim1.nsbtx
Sprite fields:
Input ID 1: value at nybble 0-1. On ID 1 the water will rise then lower. (This is wrong [E version])
Input ID 2: value at nybble 2-3. On ID 2 the water will rise, but have to be activated again with a stop command to lower.
Water lowering's delay: value at nybble 4. Any value other than 0 will override both Input IDs.
Water rising's delay: value at nybble 5. Any value other than 0 will override both Input IDs.
Opacity: value at nybble 6-7. Modulo 32. 0 is transparent. 31 has the highest opacity.
Tiles to move: value at nybble 8-9
Speed: value at nybble 10-11. Modulo 128. If lower than 128 then the water will rise, if greater or equal than 128 the water will lower.